Le-moors



(No Model.)

W. P. WHITE & R/WALLBANK. PROMOTING COMBUSTION IN FURNACES.

No. 405,817. Patented June 25, 1889.

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UNITED STATES- PATENT OFFICE.

\VILLIAM P. WVHITE, OF MANCHESTER, AND ROVERT VALLBANK, OF BOLTON-LE-MOORS, COUNTY OF LANCASTER, ASSIGNORS TO JAMES HENRY HEAP,

OF ACCRINGTON, ENGLAND.

PROMOTING COMBUSTION IN FURNACES.

SPECIFICATION forming part of Letters Patent No. 405,817, dated June 25,1889.

Application filed December 20, 1888. Serial No. 294,221. (No model.)Patented in England A ril 5, 1888, No. 5,053.

To all whom it may concern:

Be it known that we, XVILLIAM PAYNE WHITE, of Manchester, county ofLancaster, England, agent, and ROVERT \VALLBANK, of

42 Back Commission Street, Bolton-le-Moors,

also in the county of Lancaster, England, operative, have inventedcertain Improvements in Means for Promoting the Combustion of Gases inSteam-Generator and other Furnaces,

(for which we have obtained a patent in Great Britain, No. 5,053, datedApril 5,1888,) of which the following is a specification.

Our invention relates, principally, to the furnaces of steam-generators,and has for its object to lessen the production of smoke by promotingthe more perfect combustion of the gases which are developed from theburning fuel in the furnaces, as is well understood. To this end wedeliver air into the restricted space above the bridge, or into a partof the flue near this point, the current of air being in- -duced by theaction of a fan or blower which is operated by a wheel or steam-turbinewhich is acted upon by a jet or by jets of steam, or

the fan or blower is directly acted upon by the steam. The air becomesheated 011 its way from the fan to the point of delivery. The heated airmingling with the gases or products of combustion of the fuel effectsthe more complete combustion of the carbon,and

thereby prevents or lessens the production of smoke and effects aneconomy in the consumption of fuel.

Our invention, although designed principally for use in. connection withsteam-generator furnaces, may be applied to other furnaces for which itmay be suitable.

In order that our said invention may be properly understood,we will nowproceed more 0 particularly to describe the same with reference to theannexed drawings, in which- Figure 1 is a sectional view of a portion ofthe shell and flue of a steam-boiler to which our invention is shownapplied.

In the said figure, a is the shell of the boiler, Z) is the flue, c isthe bridge, and d is the furnace-grate. The pipe whereby the air is ledto the furnace is marked 6. The said pipe is situated above the bridgeand over the front thereof, so as to command the smoke and products ofcombustion as they are passing or about to pass over the bridge 0. We

at present consider the position of the pipe as indicated in thedrawings to be most favorable to the purposes of our invention; but wedo not confine ourselves to this position, as it might be placed fartherback or farther for Ward. The pipe 6 extends through the boilerspace tothe outside of the boiler, where it is connected with another pipe 6,which is surmounted by or placed in communication with a fan f or otherair forcing or blowing apparatus suitable for creating a current of airdownward into the flue. The fan f is preferably driven by a jet of steamled by the pipe 6 g from the boiler or from another source of pressure,which jet of steam impinges upon the tips of the vanes and rotates thefan f, so

as to draw a supply of atmospheric air and force it through the pipes e6' into the flue. The steam-jet may be governed or out off by a valve g.In its passage through the pipe 6 the air becomes heated and isdischarged above the bridge upon the smoke and heated products ofcombustion, causing them to burst into flame. The emission of smoke isthereby prevented, and the fuel burned in the furnace is more completelyutilized.

Instead of leading the air-pipe 6 directly through to the flue andbridge, as shown in the drawings, we might lead it from the front orback or from another part of the boiler. For example, in the drawings wehave indicated in dotted lines the position of the pipe when extended tothe front of the boiler, the said dotted lines being marked e Theairforcing apparatus would in that case be fixed at or near the pointwhere the pipe 6 enters the shell and as indicated by the dotted lines fTo do not, however, restrict ourselves to the position or direction ofthe air-pipe, as it might be introduced into the boiler at any suitablepoint and led in any desired direc tion, so long as it is caused todischarge into the flue and above the bridge in the manner 5 indicated.To regulate or to cut off the supply of air to the furnace, we place athrottlevalve 2' in the pipe 6, which is opened and closed by a weightedlever and chain 'or by any other suitable means.

In the cases of boilers having more than one furnace each furnace may besupplied by a separate fan, or one fan may supply air to two or morefurnaces.

The diagram Fig. 2 indicates 110W a single fan may supply air to twofurnace-fines by means of a breeches-pipe fixed either inside or outsideof the boiler, as preferred. More than one air-pipe may be used for eachflue.

The invention is applicable to furnaces other than those ofsteam-generators.

We are aware that air and air and steam combined have been heretoforefed to the flues or furnaces of steam-boilers-in various manners, and wedo not Wish to be understood as claiming, broadly, such application ofair or air and steam to promote combustion.

names to this specification in the presence of 3 two subscribingWitnesses.

W, P. WHITE. V ROVERT WALLBANK.

Witnesses:

DAVID FULTON, FREDK. DILLON.

